[clang] [clang] Add support for new loop attribute [[clang::code_align()]] (PR #70762)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Please be sure to add a reasonable description to the patch summary so that reviewers know more about what's going on, but thank you for already having written docs (that helps give context).

The changes should come with a release note as well.

https://github.com/llvm/llvm-project/pull/70762